Well, it's not a question of whether people are allowed to work on remotely or not. That's not at issue in this situation: Dell's policy is that you can if you

Well, it's not a question of whether people are allowed to work on remotely or not. That's not at issue in this situation: Dell's policy is that you can if you want. The issue is on what grounds people should be promoted. This may also be entirely at the discretion of the company, and any silly reasons it wants to use. Or, it may be classified as a form of discrimination, like refusing to promote someone because of ethnicity, gender, disability, age, or other categories. I don't know the law here, if it's even been settled.